Rough skin on the chest like chicken skin may be caused by follicular keratosis, sebaceous cysts or eczema-like dermatitis. 1. Follicular keratosis: If the skin on the chest simply becomes rough, like chicken skin, with no other abnormal symptoms, it may be follicular keratosis, which is usually related to the individual’s skin type. 2. Sebaceous cysts: Rough skin on the chest like chicken skin may also be sebaceous cysts, which means that the secretions inside the hair follicles are not discharged properly, thus making the skin bulge. 3. eczema-like dermatitis: chest skin rough like chicken skin if accompanied by symptoms of itching, may be eczema-like dermatitis, the cause of this disease is not clear. It is recommended to actively go to the relevant departments of the regular hospital to find out what causes, and follow the doctor’s instructions to use the appropriate solutions.