■ Eyelid Lesions and Tissues of Origin
All lesions that involve the eyelids or any other region of the body can be thought of as deriving from two basic sources. Those that arrive in the lids from other more remote sources are exogenous lesions. These include metastatic tumors from sites such as the breast or lung. Also included here are infiltrations in the dermis and epidermis of cellular or other materials that secondarily involve eyelid structures. Included here are diseases such as amyloidosis, sarcoidosis, infectious inflammations such as herpes and cellulitis, xanthelamas, acute atopic dermatitis, erythema multiforme, granuloma annulare, and lymphoid and myeloid infiltrates. All exogenous lesions disturb the normal eyelid architechture to some extent, and may be generalized or confined to specific eyelid tissue types.