Solar cell efficiency may get a bump from bumps. New research suggests that building tiny domes into the surface of organic solar cells could boost their efficiency by up to two-thirds, while ...

The chewing surface of a molar has a bumpy, valley-like shape. This acts like the teeth of a saw, helping to easily grip food that enters the mouth and grind it into smaller pieces. If the chewing ...

Bumps on the scalp can be caused by other skin disorders such as folliculitis, scalp acne, or dandruff. They could also show up due to an allergic reaction to a product or skincare routine. Most of ...

Medically reviewed by Susan Bard, MD Hives are red, raised bumps that stem from allergies, infections, or stress.Flea and chigger bites look like small, red, pimple-like bumps and feel very ...

Molluscum contagiosum, a common skin infection, causes small, painless bumps that can last months. It’s mostly harmless but can be easily transmitted through shared items, touch, or sexual activity.