Inflammation of the sebaceous glands may be caused by contact dermatitis, atopic dermatitis, seborrheic dermatitis, neurodermatitis, or insect bite dermatitis. A variety of lesions such as rashes, acne, pustules, nodules, cysts, and scarring are commonly seen. 1. Contact dermatitis: contact dermatitis is mainly manifested as erythema, papules and papules, and in severe cases, blisters will appear, accompanied by itching or burning pain, the pattern of lesions is related to contact with the contact material, and if long-term repeated contact with the irritant may lead to localized lesions of mild hyperplasia and mossy changes. 2. Atopic dermatitis: atopic dermatitis will appear papules, erythema, vesicles, mossy lesions and hyperpigmentation and other approved states, and accompanied by long-term and different degrees of itching. 3. Seborrheic dermatitis: Seborrheic dermatitis is usually characterized by erythema with scales that are fine and greasy. 4. Neurodermatitis: Neurodermatitis is usually characterized by flat papules of normal skin color or reddish or tawny color, with a smooth surface or a small amount of scales. 5. Insect bite dermatitis: Insect bite dermatitis is usually manifested as bright red, windswept lesions with small blisters in the center of the lesions, and hemispherical blisters appear on the basis of edematous erythema in some patients with obvious itching. The causes of sebaceous gland inflammation are many, the specific situation should be timely to the hospital for a clear diagnosis, and under the guidance of a professional doctor combined with the individual situation for targeted treatment.