Is locoid (hydrocortisone butyrate) lipocream smart to use on an allergic rash?

Depends on cause: Knowing the cause of rash is helpful in determining if the Locoid (hydrocortisone butyrate) will help. Locoid (hydrocortisone butyrate) and other topical steroids are good for non-infectious inflammatory disorders of the skin like eczema, dermatitis, psoriasis and allergic contact dermatitis. However, fungal and bacterial skin infections will do worse with topical steroids. See a doctor if it does not improve.