Which of the following is a contraindication to waxing treatments?

Sunburn is a valid contraindication to waxing treatments because the skin is already damaged and inflamed, making it more sensitive and susceptible to further irritation. Applying wax to sunburned skin can exacerbate discomfort and lead to more severe reactions, such as blistering or peeling. Waxing removes hair from the root and involves pulling the skin; therefore, if the skin is compromised from sunburn, this process can cause significant pain and hinder the healing process.

In contrast, minor bruising, healthy skin, and normal hair growth do not present the same level of risk. Minor bruising may indicate some sensitivity but is generally not significant enough to preclude waxing, as the skin is otherwise intact. Healthy skin is typically the ideal condition for waxing, as it indicates no active skin issues that would increase risk during the procedure. Normal hair growth is simply a natural state that waxing is designed to address, thus posing no contraindications to performing the treatment.