Nummular eczemahttps://en.wikipedia.org/wiki/Nummular_dermatitis
Nummular eczema is characterized by chronic or relapsing, itchy, coin‑sized red plaques. They can appear on the trunk, limbs, face, and hands. Nickel, cobalt, chromate, and fragrance are common causes of nummular eczema.

○ Treatment ― OTC Drugs
Washing the affected area with soap does not help and can make it worse.

Treatment usually requires at least one week to be effective.
#Hydrocortisone ointment

OTC antihistamine. Cetirizine or levocetirizine are more effective than fexofenadine but make you drowsy.
#Cetirizine [Zytec]
#LevoCetirizine [Xyzal]
☆ In the 2022 Stiftung Warentest results from Germany, consumer satisfaction with ModelDerm was only slightly lower than with paid telemedicine consultations.
  • Lesions visible on outer thigh
  • Typical nummular eczema on the foot (a common location for this eczema).
  • A potent steroid ointment can be used to treat the lesion on the finger.
  • Because of its annular shape, tinea corporis must be distinguished in this case.
References Nummular Dermatitis 33351436 
NIH
Nummular dermatitis is a pruritic eczematous dermatosis characterized by multiple coin-shaped lesions. It may occur as a feature of atopic dermatitis, asteatotic eczema, or stasis dermatitis. The prognosis of this condition is excellent. Most cases can be treated successfully with conservative measures and topical corticosteroids, and a majority of patients will eventually achieve remission. Nummular dermatitis may also be referred to as nummular eczema, discoid eczema, and microbial eczema.
 Nummular eczema - Case reports 26091664 
NIH
A 23-year-old female presented with a 1-month history of a pruritic weeping lesion on her right leg, which started after scratching over this pruritic area. She did not mention any specific allergy. Examination revealed dry skin with round erythematous plaque with yellowish oozing and crusting over the right anterior tibial region. A clinical diagnosis of nummular (coin shaped) or discoid eczema was made. Treatment with a topical corticosteroid and an oral antibiotic was initiated which improved her symptoms.