Hyaluronic acid, acidic mucopolysaccharide, and a marked increase in mucin, which is deposited diffusely or restrictively within the skin is the cause of cutaneous mucin deposition. A large amount of mucin is deposited in the dermal reticular layer, and collagen fibers are separated and replaced by mucin, becoming small cystic cavities, and more mucinoblast proliferation is seen at the mucin deposits. There was no increase in collagen and no inflammatory cell infiltration. It is due to the restricted proliferation of fibroblasts, which produce excess mucin and deposit it in the local tissues, as seen in multiple nigra syndrome. The lesions are light red single or multiple papules or nodules, approximately 2 cm in diameter, with smooth epidermis, and can be seen anywhere on the body surface. There are no conscious symptoms and it can heal spontaneously.