Dermatology - Erosion  An erosion is a superficial skin lesion that affects only the outer layer (epidermis) and does not extend into the deeper layer (dermis). The erosion is distinctly delineated, crimson in color, and exuding fluid. The superficial er

Dermatology - Ulcer  The term "ulcer" is derived from the Latin word for sore. An ulcer is a skin lesion that penetrates into the dermis or subcutis. Ulcers are invariably a consequence of pathologically modified tissue. Ulcers can exhibit raised, eroded,

Dermatology - Scar  A scar is the fibrous tissue that has grown in place of a previous wound or ulcer. • Hard, hypertrophic scars are possible. • Soft, atrophic scars are possible. • The skin's tissue compartments may diminish or disappear entirely; scars

Dermatology - Atrophy  Atrophy is the term used to describe a reduction in size or thickness of one or more layers of the skin. Abnormalities Epidermal atrophy is characterized by a reduction in the thickness of the epidermis. • The outer layer of the ski

Dermatology - Cyst  Cyst  A cyst is an enclosed sac filled with either liquid, solid, or semi-solid substances. Cysts can be either superficial or deep. Cysts are often round and have a morphology similar to a papule or nodule. When touched, they feel fi

Dermatology -Superficial spreading  Melanoma  Superficial Spreading melanoma ( SSM)  Light-skinned individuals are more likely to develop SSM melanoma (70%), which typically appears on the upper back. It is a morphologically unique lesion that grows very

Dermatology - Wheals  Wheals occur as a result of edema in the papillary layer of the dermis. An eruption characterized by raised, itchy skin lesions is referred to as an urticarial exanthema or urticaria. A wheal is a transient skin lesion that appears

Dermatology - Vesicles and Bullae  Vesicle is derived from the Latin word "vesicula," which means "little bladder," while bulla is derived from the Latin word "bulla," which means "bubble." A skin eruption characterized by the presence of small fluid-fil

Dermatology - Crust  The term "crust" originates from the Latin word for rind, bark, or shell. Crusts form when serum, blood, or purulent discharge dries on the surface of the skin. • Crusts can vary in thickness and texture, ranging from thin, delicate,

Dermatology - Scales  The term "squames" is derived from the Latin word meaning "scale." A skin condition characterized by the presence of raised lesions with scales is referred to as a papulosquamous exanthem. Scales are thin layers of the outermost la