Urticariahttps://en.wikipedia.org/wiki/Hives
Urticaria is a type of skin rash characterized by red, raised, itchy bumps. The patches often move around, typically last a few days, and do not cause lasting skin changes. Fewer than 5 % of cases persist for more than six weeks. Urticaria frequently occurs after an infection or as a result of an allergic reaction, such as to medication or food.

Prevention involves avoiding the trigger. Treatment is usually with antihistamines such as diphenhydramine and ranitidine. In severe cases, corticosteroids or leukotriene inhibitors may also be used. Keeping the environment cool can provide temporary relief. For cases that last more than six weeks, immunosuppressants such as ciclosporin may be considered.

Urticaria is common, affecting about 20 % of people. Acute urticaria occurs equally in males and females, whereas chronic urticaria is more common in females. Acute urticaria is more frequent in children, while chronic urticaria is more common in middle‑aged adults. If it persists for more than two months, it often continues for years before eventually resolving.

○ Treatment ― OTC Drugs
Acute urticaria usually resolves within a week, but chronic urticaria can last for years, although most cases eventually improve. In chronic urticaria, regular use of an antihistamine is recommended, with the expectation that the condition will improve over time.

OTC antihistamines. Cetirizine or levocetirizine are more effective than fexofenadine but may cause drowsiness.
#Cetirizine [Zytec]
#LevoCetirizine [Xyzal]

For chronic urticaria, non-drowsy antihistamines such as fexofenadine are preferred.
#Fexofenadine [Allegra]
#Diphenhydramine [Benadryl]
#Loratadine [Claritin]
☆ In the 2022 Stiftung Warentest results from Germany, consumer satisfaction with ModelDerm was only slightly lower than with paid telemedicine consultations.
  • Lesions suspected of being Erythema multiforme minor or urticarial vasculitis rather than typical urticaria.
  • It is a typical case of hives. Lesions can move every few hours.
  • Urticaria ― arm
  • Cold urticaria
  • Cold urticaria
  • Hives on the left chest wall. Notice that the lesions are slightly raised.
  • Typical urticaria
  • Urticarial Vasculitis
  • Dermographic urticaria; It is usually a chronic urticaria and can persist for several years before suddenly disappearing.
  • Dermatographic urticaria
References Acute and Chronic Urticaria: Evaluation and Treatment 28671445
Urticaria, often characterized by itchy wheals and sometimes swelling of the deeper skin layers, is typically managed by avoiding triggers, if known. The primary treatment involves second-generation H1 antihistamines, which can be adjusted to higher doses if needed. Additionally, other medications like first-generation H1 antihistamines, H2 antihistamines, leukotriene receptor antagonists, potent antihistamines, and short courses of corticosteroids may be used alongside. For persistent cases, referral to specialists for alternative therapies like omalizumab or cyclosporine may be considered.
 Urticaria and Angioedema: an Update on Classification and Pathogenesis 28748365
 Chronic Urticaria 32310370 
NIH
Second-generation H1-antihistamines (e.g., cetirizine, loratadine, fexofenadine), Omalizumab, Ciclosporin, and short courses only of systemic corticosteroids
 Angioedema 30860724 
NIH
Angioedema is non-pitting edema that involves subcutaneous and/or submucosal layers of tissue that affects the face, lips, neck, and extremities, oral cavity, larynx, and/or gut. It becomes life-threatening when it involves the larynx.