Which service is specifically contraindicated for someone with a skin infection?

Shaving is specifically contraindicated for someone with a skin infection because it involves the use of a blade that can irritate the skin and potentially exacerbate the infection. When the skin is already compromised, such as in the case of an infection, shaving can lead to further irritation, spread the infection to other areas of the skin, or even introduce bacteria into the bloodstream.

In contrast, hair coloring, hair cutting, and beard trimming are generally safer procedures, as they do not directly disrupt the skin. While precautions should always be taken to ensure cleanliness and avoid cross-contamination with any of these services, they do not carry the same risk of worsening a skin condition as shaving does.