Thinned Epidermis
This suggests epidermal destruction as occurs in erythema mutiforme , lupus erythematosus, dermatomyositis and in lichen sclerosus. Epidermal consumption can also be a feature of melanoma.
The commonest cause of epidermal thinning is ageing and sun damage but remember the regional differences in the body with eyelid skin epidermis being particularly thin relative to other areas.