Razor bumps, also known as pseudofolliculitis barbae, are small, irritated bumps that appear on the skin after shaving. They are caused by the hair shaft becoming ingrown and curling back into the skin, causing irritation and inflammation. Razor bumps are more common in people with curly or coiled hair, as the hair is more prone to becoming ingrown.

There are several ways to prevent and treat razor bumps:

1. Use a sharp razor: A sharp razor is less likely to tug or pull at the hair, which can reduce the risk of ingrown hairs.

2. Shave in the direction of hair growth: Shaving in the direction of hair growth can help to prevent ingrown hairs and minimize irritation.

3. Use a moisturizing shaving cream or gel: A moisturizing shaving cream or gel will help to lubricate the skin and protect it from the razor, reducing the risk of irritation.

4. Avoid tight hairstyles: Tight hairstyles that pull or tug at the hair can increase the risk of ingrown hairs and razor bumps.

5. Exfoliate your skin: Exfoliating your skin with a scrub or an exfoliator can help to remove dead skin cells and unclog pores, reducing the risk of ingrown hairs.

6. Use a topical treatment: If you already have razor bumps, you can use a topical treatment such as a cream or lotion to help soothe irritation and reduce inflammation.

It's worth noting that everyone's skin is different, and what works for one person may not work for another. It may take some experimentation to find the products and techniques that work best for you.