Asymptomatic solitary nodule on the left arm

A solitary erythematous nodule on the arm A 31year old Kuwaiti female patient presented with a solitary skin lesion on the left arm since 1 year. The lesion started as a small red lesion that slowly progressed into a large nodule with erythematous halo. The lesion was painless and no other symptom was reported. There was no previous history of similar lesion and there was no history of any systemic disease. On examination, there was a solitary well-defined exophytic red nodule, measuring 1.1x0.9 cm. The surface of the nodule was intact and showed slight glistening. The lesion was non-tender and it was soft in consistency (Fig. 1). On the periphery, there was a halo of normal skin surrounded by a rim of purpuric lesion (Fig. 2). No abnormal findings were observed in the axillary lymph nodes and no other skin lesions were seen on general examination. Routine laboratory investigations including complete blood count, kidney function tests, liver function tests, and thyroid function tests were normal. Radiological examination (X-ray) showed no attachment to underlying structures.