What can cause raised skin bumps?

Raised skin bumps can have various causes, ranging from benign conditions to serious medical concerns. Some common causes include:

1. Acne: Clogged pores and bacterial infections can lead to pimples or cystic acne.
2. Allergic Reactions: Exposure to allergens, such as certain foods, medications, or skin products, can trigger hives or rashes.
3. Trauma or Friction: Repeated rubbing or minor injuries can result in calluses, blisters, or skin thickening.
4. Skin Cancer: Some raised bumps, like moles that change shape, color, or size, may be indicative of skin cancer and require medical attention.
5. Infections: Viral, bacterial, or fungal infections, such as warts, impetigo, or ringworm, can cause skin lesions or bumps.

Most skin bumps are harmless and resolve on their own, but consult a doctor if the bumps are painful, persist, or change appearance significantly.