Contact dermatitis is a condition in which the skin becomes red, itchy, sore, or inflamed after direct contact with a substance. There are two kinds of contact dermatitis: irritant and allergic.
Irritant contact dermatitis
Irritant dermatitis is the most common type. It's caused by contact with acids, alkaline materials such as soaps and detergents, fabric softeners, solvents, or other chemicals. The reaction can look like a red, dry scaly rash, or can look more like a burn.
Other irritants may include:
• Hair dyes
• Long-term exposure to wet diapers
• Pesticides or weed