Appearance of itchy red bumps on the skin, is part of such a reaction.Skin Diseases: Various skin diseases such as psoriasis, dermatitis, eczema, folliculitis, hidradenitis suppurativa and shingles (herpes zoster) can also give you itchy skin bumps.Treatment of Itchy Skin Bumps * Applying essential oils such as lavender and rosemary on itchy skin bumps can provide a soothing and comforting effect.