ABSTRACT
This chapter presents the case study of a 37-year-old healthcare assistant who presents to the dermatology clinic with a pruritic eruption over her right knee. The lesion had started as a small erythematous papule and then spread out very gradually to form a scaly, ring-shaped lesion. She has no history of previous skin problems. Her 7-year-old son has eczema and a dry scaly scalp. She has used some of her son’s cortisone ointment on the lesion, which seemed to reduce the itching and scaling but the lesion has continued to expand. There is an annular lesion 9 cm in diameter with a raised edge over the right knee. Marked hyperpigmentation, erythema and multiple papules and pustules are seen at the raised edge. Her scalp and nails are normal, as is the rest of her skin. She has brought her son with her to the clinic; he has a very scaly scalp with patches of alopecia and occipital lymphadenopathy.
