Urticarial vasculitishttps://en.wikipedia.org/wiki/Urticarial_vasculitis
Urticarial vasculitis is a skin condition characterized by fixed urticarial lesions that appear histologically as a vasculitis.

Treatment ― OTC Drugs
If you have a fever (increased body temperature), we recommend that you seek medical attention as soon as possible.

The suspected drug should be discontinued. (e.g. antibiotics, non-steroidal anti-inflammatory drugs)

Oral antihistamines such as cetirizine or loratadine for itching.
#Cetirizine [Zytec]
#LevoCetirizine [Xyzal]
#Loratadine [Claritin]

OTC steroid ointments may be ineffective for the low potency. Needs to be applied for more than a week to see improvement.
#Hydrocortisone ointment
      References Urticarial vasculitis 34222586 
      Urticarial vasculitis is a rare clinicopathologic entity that is characterized by chronic or recurrent episodes of urticarial lesions. Skin findings of this disease can be difficult to distinguish visually from those of chronic idiopathic urticaria but are unique in that individual lesions persist for ≥24 hours and can leave behind dusky hyperpigmentation. This disease is most often idiopathic but has been linked to certain drugs, infections, autoimmune connective disease, myelodysplastic disorders, and malignancies. More recently, some authors have reported associations between urticarial vasculitis and COVID-19, as well as influenza A/H1N1 infection. Urticarial vasculitis can extend systemically as well, most often affecting the musculoskeletal, renal, pulmonary, gastrointestinal, and ocular systems. Features of leukocytoclastic vasculitis seen on histopathologic examination are diagnostic of this disease, but not always seen. In practice, antibiotics, dapsone, colchicine, and hydroxychloroquine are popular first-line therapies, especially for mild cutaneous disease. In more severe cases, immunosuppressives, including methotrexate, mycophenolate mofetil, azathioprine, and cyclosporine, as well as corticosteroids, may be necessary for control. More recently, select biologic therapies, including rituximab, omalizumab, and interleukin-1 inhibitors have shown promise for the treatment of recalcitrant or refractory cases.
       Faropenem-induced urticarial vasculitis - Case reports 33580928
      A 35-year-old man came in with a 15-day history of bright red, painful rashes on both thighs and legs, along with joint pain. He had a urinary tract infection for a week before the rash appeared. His skin showed several tender, ring-shaped, partially blanchable, red plaques on both sides of his thighs and legs. He was given oral prednisolone (40mg/day) for a week along with a non-drowsy antihistamine (fexofenadine). Within a week, all the rashes disappeared completely. There were no more rashes during the next 6 months of regular check-ups.