Using a derma stamp on the scalp is generally considered safe and side effects are rare when used properly. Thanks to the needles' vertical penetration, they minimize trauma to the skin which can reduce the risk of side effects. As a precaution and to maximize the benefits, after using the derma stamp, wait about 6 hours before applying products like minoxidil. This helps enhance the absorption of the product while minimizing any potential irritation that can occur when the scalp's pores are open. Always ensure that you are using the derma stamp according to the provided instructions and maintain good hygiene to avoid any complications.