"I have had perioral dermatitis for a long time and I am wondering what product to use to avoid making it worse?"

Dermatitis around the mouth can be caused by various factors such as cortisone creams, fluoride in toothpaste, and over-hydration of the skin. It is important to stop using these products and consult a healthcare professional for proper treatment. In this case, it is recommended to continue using erythromycin cream for about 10 days after the symptoms disappear. The redness may not go away immediately, but it is important to moisturize the skin and avoid using irritants like makeup and harsh soaps.