Fig. 1. Ruptured epidermal cyst. (A) Erythematous 2×2 cm subcutaneous nodule. (B) Dermoscopic view showing peripheral linear branched vessels with an erythematous rim (arrowheads) against an ivory-white background. (C) Microscopic view showing a cystic lesion with dense inflammation surrounding the ruptured cyst (patient 5 in the ruptured-cyst group).
