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Symptoms and Signs – Differential Diagnosis of Foot drop
Common peroneal nerve lesion: mononeuritis multiplex, e.g. diabetes mellitus
Injury to the dorsiflexors, compartment syndrome
LS root lesion (radiculopathy), e.g. inter-vertebral disc prolapse
Muscular
Neurological
Rarer: motor neuron disease, multiple sclerosis, stroke
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Symptoms and Signs – Differential Diagnosis of Epistaxis
Anticoagulants, bleeding disorders
Hereditary haemorrhagic telangiectasia
Nasal tumours
Trauma/irritation: nose picking, forceful blowing, foreign body, chronic intranasal drugs use (e.g. cocaine)
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​Symptoms and Signs –Differential Diagnosis of Erythema multiforme
Malignancy (lymphoma, leukaemia, myeloma), radiation
Inflammatory/connective tissue diseases: rheumatoid arthritis, SLA, sarcoidosis, PAN, Wegener's granulomatosis
Infection: viral (HSV, EBV, orf), bacterial (Mycoplasma pneumoniae, chlamydiae), fungal (histoplasmosis, coccidiomycosis)
Idiopathic
Drugs: sulphonamides, penicillins, anticonvulsants
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Symptoms and Signs – Differential Diagnosis of Erythema nodosum
Pregnancy
Malignancy: lymphoma, leukaemia
Inflammation: inflammatory bowel disease, sarcoidosis, Bechet's disease
Infection: Bacterial (Streptococcus, Chlamydia, TB, Yersinia, Rickettsia, leprosy, leptospirosis), Viral (EBV), Fungal (histoplasmosis, coccidiomycosis, blastomycosis), Protozoa! (toxoplasmosis)
Drugs: sulphonamides, penicillin, oral contraception, salicylates, dapsone
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​Symptoms and Signs – Differential Diagnosis of Swollen Eyelids 
Orbital cellulitis
Herpes zoster ophthalmicus
Herpes simplex
Dacryocytitis
Chalazion, stye, spread of infection from a local lesion e.g. a squeezed comedo
Blepharitis (may be associated with rosacea, eczema, psoriasis)
Allergy (contact with cosmetics, chemicals, animals, plants)
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​Symptoms and Signs – Differential Diagnosis of Facial nerve palsy
Unilateral
Vascular: brainstem infarction
Tumours: brainstem, cerebellopontine angle (acoustic neuroma), meningeal infiltration, parotid gland
Trauma or surgery of the face
Inflammation: sarcoidosis (meningeal inflammation), multiple sclerosis (demyelination in brainstem)
Infection (petrous bone): middle ear infection or herpes zoster
Bell's palsy (idiopathic)

Bilateral
Sarcoidosis
Myasthenia gravis
Muscular dystrophy
Motor nurone disease
Infections: Lyme disease, HIV
Guillain-Barre syndrome
Congenital facial diplegia
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​Symptoms and Signs – Differential Diagnosis of Facial pain
Neurological
Trigeminal neuralgia
Postherpetic neuralgia
Migrainous neuralgia and migraine
Glossopharyngeal neuralgia
Giant cell arteritis

Local causes
Temporomandibular joint dysfunction
Sinusitis
Referred cardiac pain
Post-traumatic
Orbital and ocular disease, optic neuritis, retro-orbital disease (e.g. posterior communicating artery aneurysm)
Nasopharyngeal tumours
Ear and parotid disease
Dental/oral disease
Atypical facial pain
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Kembara Xtra 

Facts about medicine and its subtopic such as anatomy, physiology, biochemistry, pharmacology, medicine, pediatrics, psychiatry, obstetrics and gynecology and surgery.