How to treat redness that turns dark around my mouth and is not itching ?

May treat as eczema: Sometimes, such lip symptoms may be treated as lip eczema, which can be cared for like skin eczema, using hydrocortisone cream for a week, plus Vaseline or Aquaphor to retain moisture. Lip sunscreen chemicals sometimes can cause an allergic reaction on lips. Other times, a person is a primary lip-licker (it is a habit). Once inflamed, lips can get irritated by routine foods, juices, and saliva.