Diagnose actinic keratosis. Diagnose acne keloidalis nuchae. Diagnose rosacea. Diagnose venous stasis ulcers. Manage black hairy tongue. Diagnose psoriatic nail disease. Treat pitted keratolysis. Treat inflammatory skin disease on an area of thin skin. Diagnose allergic contact dermatitis. Diagnose androgenetic alopecia in a woman. Manage recalcitrant condylomata acuminata. Diagnose neuropathic ulcers. Recognize hirsutism associated with polycystic ovary syndrome. Treat rhus dermatitis. Treat stasis dermatitis. Diagnose hidradenitis suppurativa. Diagnose squamous cell carcinoma. Diagnose interstitial lung disease associated with dermatomyositis. Treat basal cell carcinoma. Recommend appropriate sun protection. Diagnose intertrigo. Manage generalized pruritus without a primary skin rash. Diagnose scabies. Diagnose allergic contact dermatitis. Treat toxic epidermal necrolysis. Diagnose subacute cutaneous lupus erythematosus. Treat a hospital-acquired skin infection. Diagnose localized alopecia areata. Diagnose calciphylaxis. Treat impetiginized insect bite. Manage pityriasis rosea in a patient at risk for syphilis. Manage dysplastic nevus syndrome. Treat pyoderma gangrenosum. Diagnose pretibial myxedema. Diagnose bedbug infestation. Diagnose erythroderma. Manage potential complications of herpes zoster infection. Diagnose drug reaction with eosinophilia and systemic symptoms. Manage lichen sclerosus in a postmenopausal woman. Diagnose fixed drug eruption. Diagnose Sweet syndrome. Diagnose eosinophilic pustular folliculitis. Manage a superficial skin infection. Recognize livedo reticularis. Diagnose seborrheic keratosis. Manage a patient with acute urticaria. Treat seborrheic dermatitis. Diagnose basal cell carcinoma. Treat mild acne in a pregnant woman. Diagnose herpes simplex virus infection. Diagnose miliaria. Manage arterial ulcers. Treat cutaneous larva migrans. Recognize the prognostic features of malignant melanoma. Manage a patient with acute urticaria. Diagnose subungual melanoma. Diagnose bullous pemphigoid. Recognize striae and atrophy from potent topical glucocorticoids. Manage severe, recalcitrant acne vulgaris. Diagnose porphyria cutanea tarda. Manage urticarial vasculitis. Diagnose stasis dermatitis. Diagnose Staphylococcus aureus infection of atopic dermatitis. Treat postinflammatory hyperpigmentation due to acne in a patient with darker skin. Treat superficial dermatophyte infections (tinea). Diagnose cutaneous vasculitis. Treat hand dermatitis. Diagnose drug hypersensitivity syndrome. Diagnose psychogenic itch. Recognize the association of dermatitis herpetiformis with celiac disease. Diagnose sarcoidosis. Treat chronic cutaneous lupus erythematosus.