A 54-year-old woman self-refers to dermatology for evaluation of asymptomatic lesions on her legs. Over the past several years, they have slowly grown larger, redder, and shinier. She denies any other skin problems. Medical history is significant for type 2 diabetes, which, according to the patient, is under good control.
The patient has sought care from a variety of professionals, including her primary care provider, her endocrinologist, and her gynecologist. Various diagnoses, including “fungal infection,” have been posited; treatment with antifungal cream and oral medications produced no effect.
She also consulted the proprietor of her local health food store, who actually examined her before diagnosing “yeast infection” and advising her to change her diet.
EXAMINATION
There are large, oval, reddish brown shiny plaques, measuring about 8 x 4 cm, on both anterior tibial areas. On closer inspection, the affected skin is yellowish pink and appears quite atrophic. This effect is more pronounced toward the centers of the lesions, which also display distinct telangiectasias. The borders of the plaques are slightly raised.
Examination of the rest of the patient’s skin reveals no other abnormalities.
What is the diagnosis?