Cheilitishttps://en.wikipedia.org/wiki/Cheilitis
Cheilitis is a condition characterized by inflammation of the lips.

Actinic cheilitis
Mainly caused by sun exposure and more common in people with fair skin. There is a risk that this condition can progress to squamous cell carcinoma over time.

Allergic cheilitis
It is divided into endogenous (due to an inherent characteristic of the individual) and exogenous (caused by an external agent). The main cause of endogenous eczematous cheilitis is atopic cheilitis, while the main causes of exogenous eczematous cheilitis are irritant contact cheilitis (e.g., from a lip‑licking habit) and allergic contact cheilitis.

The most common triggers of allergic contact cheilitis are lip cosmetics, including lipsticks and lip balm, followed by toothpaste. Even brief exposure, such as kissing someone who is wearing lipstick, can provoke contact cheilitis. Allergies to metal, wood, or other components can cause cheilitis in musicians, especially players of woodwind and brass instruments—for example, “clarinetist’s cheilitis” or “flutist’s cheilitis”.

Treatment ― OTC Drugs
If the inflammation is limited to the upper lip, it may be due to prolonged sun exposure. Protect the lips from the sun and see your doctor regularly. Avoid lipsticks or lip balms that contain potential allergens. Applying an over‑the‑counter steroid cream and taking an over‑the‑counter antihistamine can be helpful.
#Hydrocortisone cream

#Cetirizine [Zytec]
#Diphenhydramine [Benadryl]
#LevoCetirizine [Xyzal]
#Fexofenadine [Allegra]
#Loratadine [Claritin]
☆ In the 2022 Stiftung Warentest results from Germany, consumer satisfaction with ModelDerm was only slightly lower than with paid telemedicine consultations.
  • Lipstick may be an important cause.
  • Erythema around the lips.
  • Angular Cheilitis, mild case ― Unlike herpes infection, there are no blisters.
  • Lip licker's dermatitis ― It is caused or worsened by applying saliva to the lips.
  • Angular cheilitis ― In most cases, it is accompanied by a mild infection, so antibiotic treatment is required. Unlike herpes infections, eczema on the lip is frequently observed.
  • Lip licker's dermatitis ― It frequently occurs in children.
References Differential Diagnosis of Cheilitis - How to Classify Cheilitis? 30431729 
NIH
The disease may appear as an isolated condition or as part of certain systemic diseases/conditions (such as anemia due to vitamin B12 or iron deficiency) or local infections (e.g., herpes and oral candidiasis). Cheilitis can also be a symptom of a contact reaction to an irritant or allergen, or may be provoked by sun exposure (actinic cheilitis) or drug intake, especially retinoids. Generally, the forms most commonly reported in the literature are angular, contact (allergic and irritant), actinic, glandular, granulomatous, exfoliative and plasma cell cheilitis.
 Cheilitis 29262127 
NIH