Peak Season for This Dermatitis Is Here — Be Careful When Taking Your Child Out to Play

Summer brings a surge in sand dermatitis (frictional lichenoid dermatitis) among preschoolers. Learn how to identify it, distinguish it from similar conditions like papular acrodermatitis and dyshidrotic eczema, and treat it effectively.

Summer is here, and many parents have noticed that after their child comes back from playing outside, small bumps suddenly appear all over their hands.

At first, there is no pain or itching, so parents don't think much of it. But within a few days, the bumps multiply, and the child starts scratching non-stop — the more they scratch, the itchier it gets; the itchier it gets, the more they scratch...

This is not eczema, nor is it mosquito bites. It is a skin condition that peaks during this season — "sand dermatitis" (frictional lichenoid dermatitis).

What Is Sand Dermatitis?

Sand dermatitis is also known medically as frictional lichenoid eruption, juvenile papular dermatitis, or summertime pityriasis of the elbows and knees. The names sound intimidating, but it is actually quite common in everyday life.

1. Cause of the Disease

Simply put, the core mechanism is skin barrier damage combined with repeated frictional stimulation, leading to papules and itching.

Therefore, sand dermatitis most commonly affects preschool-aged children during summer and autumn. This is because children's stratum corneum is thin and their skin barrier function is immature — friction damages the stratum corneum and easily triggers an inflammatory response. Additionally, it may be associated with atopic dermatitis and an allergic constitution.