Scientific evidence also shows that oatmeal has some antioxidant and anti-inflammatory qualities, which are great for your skin. Don’t use hot water in your oatmeal baths—this can actually irritate your skin. If you don’t have any colloidal oatmeal on hand, blend 1 cup (129 g) of oatmeal in a food processor first until it turns into a powder. You can also purchase a ready-made product if you prefer. It may include other ingredients but avoid fragrance. [6] X Expert Source Lydia Shedlofsky, DODermatologist Expert Interview. 30 September 2020. Make sure to use a fragrance-free cream afterwards. [7] X Expert Source Lydia Shedlofsky, DODermatologist Expert Interview. 30 September 2020.

Small dogs only need about ⅓ cup (43 g) of colloidal oatmeal in the bath, while bigger dogs might need ½ to 1 cup (65-129 g). If your dog still seems itchy after the bath, call your vet for advice.

A nice soak in an oatmeal bath can help loosen some of the psoriasis “scales” on your skin. [10] X Expert Source Lorena BarcalClinical Herbalist & Clean Beauty Specialist Expert Interview. 28 June 2020. [11] X Research source

If you plan on washing up during your oatmeal bath, choose a mild soap that won’t irritate your skin even more. Pat your skin dry after the bath instead of rubbing it.

When you’re not soaking in an oatmeal bath, treat the rash with calamine lotion, hydrocortisone cream, or a cool compress. Antihistamine pills might also help make the itching go away.

Always talk to a doctor if you’re dealing with any unexplainable side effects from your treatment.