My 4 year old son has tiny red bumps around his mouth what could it be?

Perioral Dermatitis: Perioral dermatitis (pod) is a chronic papulopustular and eczematous facial dermatitis. It mostly occurs in women and children.The clinical and histologic features of the perioral dermatitis lesions resemble those of rosacea. Patients require systemic and/or topical treatment, an evaluation of the underlying factors, and reassurance.