Lichen sclerosus mistaken for child sexual abuse.

Finally, familial cutaneous collagenoma must be differentiated from two distinct types of eruptive collagenoma. Eruptive collagenoma type 1 is clinically and histologically similar to familial cutaneous collagenoma but without documented familial inheritance. Eruptive collagenoma type 2 presents cutaneous lesions smaller than those of familial cutaneous collagenoma and arranged on the extremities and lower trunk. Both types are histologically characterized by the dermal accumulation of metachromatic, mucinous material, suggesting an actual diagnosis of lichen myxedematosus. 1,9