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Pathology - Skin infections
Small red, sensitive pustules are the initial sign of acute folliculitis, an infection of the hair follicles typically caused by Staphylococcus aureus. If the acute infection spreads deeply, it may result in a furuncle with further surrounding erythema and pain. After healing, scarring could happen.
Impetigo is a very common, especially in youngsters, superficial bacterial skin illness that is highly contagious. Either Streptococcus aureus or Streptococcus (S.) pyogenes is the cause. It usually appears around the mouth and nose as vesicles with a golden yellow crust.
Staphylococcal scalded skin syndrome is a superficial blistering skin disease that is almost exclusively observed in neonates and young children. It is caused by strains of S. aureus that produce an epidermolytic toxin. The skin rash is initially erythematous and then blisters extensively, giving the appearance of a scald. Within two to three weeks, there is no scarring.
S. pyogenes causes cellulitis, a deep skin infection that primarily manifests as an erythematous rash with oedema on the legs. may resemble deep vein thrombosis in clinical settings.
The most frequently cultured organisms are S. aureus and group A B hemolytic streptococci, also known as "fleesh-eating bacteria," although the infection is frequently polymicrobial. Necrotizing fasciitis is a rapidly progressing necrotizing infection of subcutaneous soft tissues.Fournier's gangrene is a variant that occurs on the scrotum. • To prevent systemic sepsis, quick surgical debridement is necessary.
Skin-related tuberculosis • Haematogenous spread from a tuberculous infection elsewhere in the body is the primary cause of the majority of cases. • Biopsies reveal confluent tuberculoidal granulomas in the dermis, which may exhibit core necrosis; lesions primarily appear on the face, especially around the nose, as red papules and plaques with a gelatinous consistency. Since they are too few, acid-fast bacilli are typically not visible.
Mycobacterial infections that are not tuberculous
If injected into the skin, some non-tuberculous environmental mycobacteria, such as Mycobacterium (M.) marinum (linked to underwater injuries), M. fortuitum/chelonae, and M. kansasii, can cause infection. • Areas of suppurative granulomatous inflammation are commonly observed in biopsies, and within them may be a few acid-fast bacilli.
Warts caused by viruses
Human papillomavirus (HPV) infections are the cause of these extremely common skin lesions, which can appear anywhere on the skin in individuals of any age. They can manifest clinically as keratotic papules, and they can be more common in immunocompromised people. • Biopsies reveal hyperkeratosis, layers of parakeratosis, and noticeable papillomatosis. The keratinocytes exhibit vacuolation and big keratohyaline granules, which are characteristic HPV cytopathic consequences.
Simplex herpes • HSV types 1 and 2 are to blame. • Infections affect the vaginal and/or oral regions. • Because of viral latency in the sensory ganglia, infection lasts a lifetime. • Groups of vesicles on an erythematous base are the hallmark of recurrent episodes, which can be caused by a variety of reasons. • Biopsies reveal acantholysis and ballooning keratinocyte degeneration. Typical pale intranuclear inclusions are found in keratinocyte nuclei.
Chicken pox is caused by the extremely contagious varicella zoster virus (VZV), which most people contract as children. • Because of viral latency in the sensory ganglia, infection lasts a lifetime.
• Herpes zoster (shingles), which manifests as a band-like vesicular eruption along the distribution of a sensory nerve, is caused by the virus reactivating in maturity.
Contagiosum Molluscum • A molluscipoxvirus infection is the cause. • Causes clusters of tiny umbilicated papules to appear on young children's face, limbs, and trunk or on young adults' genital area. • Large basophilic cytoplasmic inclusions are present in the keratinocytes of a very characteristic lobular epidermal proliferation seen in biopsies.
Common superficial fungal infections brought on by "ringworm" fungi are known as dermatophytoses. They can result in slowly growing, scaly, erythematous annular lesions on the body (tinea corporis), head (tinea capitis), or foot (tinea pedis).
Versicolor tinea (pityriasis) In young adults, the yeast Malassezia globosa causes a superficial fungal infection that manifests as various patches of hypo- or hyperpigmentation on a fine scale. Biopsies reveal budding yeasts and hyphae within the stratum corneum (also known as "spaghetti and meatballs").
Small red, sensitive pustules are the initial sign of acute folliculitis, an infection of the hair follicles typically caused by Staphylococcus aureus. If the acute infection spreads deeply, it may result in a furuncle with further surrounding erythema and pain. After healing, scarring could happen.
Impetigo is a very common, especially in youngsters, superficial bacterial skin illness that is highly contagious. Either Streptococcus aureus or Streptococcus (S.) pyogenes is the cause. It usually appears around the mouth and nose as vesicles with a golden yellow crust.
Staphylococcal scalded skin syndrome is a superficial blistering skin disease that is almost exclusively observed in neonates and young children. It is caused by strains of S. aureus that produce an epidermolytic toxin. The skin rash is initially erythematous and then blisters extensively, giving the appearance of a scald. Within two to three weeks, there is no scarring.
S. pyogenes causes cellulitis, a deep skin infection that primarily manifests as an erythematous rash with oedema on the legs. may resemble deep vein thrombosis in clinical settings.
The most frequently cultured organisms are S. aureus and group A B hemolytic streptococci, also known as "fleesh-eating bacteria," although the infection is frequently polymicrobial. Necrotizing fasciitis is a rapidly progressing necrotizing infection of subcutaneous soft tissues.Fournier's gangrene is a variant that occurs on the scrotum. • To prevent systemic sepsis, quick surgical debridement is necessary.
Skin-related tuberculosis • Haematogenous spread from a tuberculous infection elsewhere in the body is the primary cause of the majority of cases. • Biopsies reveal confluent tuberculoidal granulomas in the dermis, which may exhibit core necrosis; lesions primarily appear on the face, especially around the nose, as red papules and plaques with a gelatinous consistency. Since they are too few, acid-fast bacilli are typically not visible.
Mycobacterial infections that are not tuberculous
If injected into the skin, some non-tuberculous environmental mycobacteria, such as Mycobacterium (M.) marinum (linked to underwater injuries), M. fortuitum/chelonae, and M. kansasii, can cause infection. • Areas of suppurative granulomatous inflammation are commonly observed in biopsies, and within them may be a few acid-fast bacilli.
Warts caused by viruses
Human papillomavirus (HPV) infections are the cause of these extremely common skin lesions, which can appear anywhere on the skin in individuals of any age. They can manifest clinically as keratotic papules, and they can be more common in immunocompromised people. • Biopsies reveal hyperkeratosis, layers of parakeratosis, and noticeable papillomatosis. The keratinocytes exhibit vacuolation and big keratohyaline granules, which are characteristic HPV cytopathic consequences.
Simplex herpes • HSV types 1 and 2 are to blame. • Infections affect the vaginal and/or oral regions. • Because of viral latency in the sensory ganglia, infection lasts a lifetime. • Groups of vesicles on an erythematous base are the hallmark of recurrent episodes, which can be caused by a variety of reasons. • Biopsies reveal acantholysis and ballooning keratinocyte degeneration. Typical pale intranuclear inclusions are found in keratinocyte nuclei.
Chicken pox is caused by the extremely contagious varicella zoster virus (VZV), which most people contract as children. • Because of viral latency in the sensory ganglia, infection lasts a lifetime.
• Herpes zoster (shingles), which manifests as a band-like vesicular eruption along the distribution of a sensory nerve, is caused by the virus reactivating in maturity.
Contagiosum Molluscum • A molluscipoxvirus infection is the cause. • Causes clusters of tiny umbilicated papules to appear on young children's face, limbs, and trunk or on young adults' genital area. • Large basophilic cytoplasmic inclusions are present in the keratinocytes of a very characteristic lobular epidermal proliferation seen in biopsies.
Common superficial fungal infections brought on by "ringworm" fungi are known as dermatophytoses. They can result in slowly growing, scaly, erythematous annular lesions on the body (tinea corporis), head (tinea capitis), or foot (tinea pedis).
Versicolor tinea (pityriasis) In young adults, the yeast Malassezia globosa causes a superficial fungal infection that manifests as various patches of hypo- or hyperpigmentation on a fine scale. Biopsies reveal budding yeasts and hyphae within the stratum corneum (also known as "spaghetti and meatballs").
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