INFECTIOUS DISEASE

ResponseContact dermatitis - pruritic lesions. Typically well demarcated, Oedema, vesicles, bullae, oozing. Often has burning/stinging/pain. History of contact with causative agent
Gout - Severe pain, warmth, erythema overlying joint. May have Tophi/Podagra. Aspirate shows urate crystals (gout) and calcium pyrophosphate crystals (Pseudogout).
Insect bite - Inflammatory reaction at site of punctured skin, rapidly appears. Localised swelling/itching/erythema.
Status dermatitis - Inflammatory dermatosis of lower extremities occurring in patient with chronic venous insufficiency.
Drug reaction - macpap rash involving trunk and proximal extremities. Recent drug changes. Diagnosis = biopsy
Superficial thrombophlebitis - tender palpable cord along effected vein. History of cannulation
DVT - tenderness, Homans’ sign, phlegmasia alba/cerulea dolens. Prior history of DVT/prolonged immobility/hypercoagulable state
Vasculitis - macpap lesions non blanching due to presence of extravasated erythrocytes in dermis. Diagnosis biopsy

ResponseNon purulent cellulitis without systemic effects
Phenoxymethylpenicillin 500 QID x 5/7
Cephalexin 500 mg QID
Clindamycin 450 mg TDS

Purulent cellulitis without systemic features (Cover s. Pyogenes and s. Aureus)
Flucloxacillin 500-1000 mg QID
Cephalexin 500-1000 mg QID
Clindamycin 450mg TDS
Bactrim 160/800 BD