Poison ivy rash is an allergic reaction to poison ivy. Poison ivy is very a common plant in the U.S. It is similar to two other plants called poison oak and poison sumac. The plants cause allergic dermatitis.

Impetigo is a skin infection. When it affects just the surface, it’s called superficial impetigo. Impetigo can also affect deeper parts of the skin. This is called ecthyma. It may occur on healthy skin. Or it may occur where the skin was injured by a cut, scrape, or insect bite.

Fifth disease is a viral illness that causes a rash. It occurs most often in the winter and spring.

Diaper dermatitis is inflammation of the skin in the diaper area. It’s a very common condition in babies and toddlers.

Cradle cap (infant seborrheic dermatitis) is scaly patches on a baby's scalp. Cradle cap isn’t serious, but it can cause thick crusting and white or yellow scales. Some babies can also have seborrheic dermatitis in the diaper area, and on the face, neck, and trunk. Cradle cap usually clears up within the first year.

Detailed information on blisters, including cause, first aid, and treatment.

Detailed information on birthmarks and the different types, including vascular birthmarks, hemangiomas, and port-wine stains.

Thumbsucking is normal in infants and young children. It shouldn't cause any permanent problems if your child stops by age 5.

A baby's first tooth often appears between 5 and 7 months of age. Some babies get their first tooth a little earlier and others a little later. Here's what you need to know.

Children's teeth begin developing in the fetus. Good nutrition from the mother during pregnancy is important in the development of the teeth.