A nurse is teaching a group of teenage clients about the use of condoms for the prevention of sexually transmitted infections (STIs). Which of the following statements should the nurse include in the teaching?

Choice A reason:
It is important to keep a Plaster of Paris cast dry because moisture can weaken the cast and irritate the skin underneath. Therefore, the cast should be covered while showering to prevent it from getting wet.

Choice B reason:
Applying ice to the foot after walking can help reduce swelling and provide pain relief. It is a common recommendation for managing discomfort associated with a walking cast. The ice should be applied over the cast at the level of the injury for 15-30 minutes, repeating every few hours for the first few days.

Choice C reason:
While a musty odor can develop over time due to sweat and lack of air circulation, it is not necessarily normal and could indicate a problem such as an infection. If there is a persistent unpleasant odor, it should be evaluated by a healthcare provider.

Choice D reason:
Numbness or pain in the toes can be a sign of compromised circulation or nerve compression and should be reported immediately. It is crucial to monitor for any changes in sensation or increased pain, as these could indicate a serious issue that requires medical attention.

Choice A reason:
Squamous cell carcinoma typically presents as a rough, scaly, red patch, open sore, or raised growth with a central depression, often on sun-exposed areas of the body. While it can appear as a lesion that varies in color, it is not commonly associated with a nevus that has increased in size.

Choice B reason:
Malignant melanoma is associated with changes in preexisting nevi, such as an increase in size and variations in color. It often appears as a mole that changes in color, size, or feel and may have irregular edges. The description of the lesion provided by the client is characteristic of malignant melanoma, making this the correct diagnosis.

Choice C reason:
Kaposi's sarcoma is a cancer that forms in the lining of blood and lymph vessels and typically appears as patches of abnormal tissue on the skin or mucous membranes. These lesions are usually red or purple and look similar to bruises¹. They are not typically described as nevi that increase in size or lesions that vary in color.

Choice D reason:
Basal cell carcinoma often appears as a slightly transparent bump on the skin, though it can take other forms. It usually presents as a pearly white or pink bump on white skin, or a brown or black bump on darker skin, and is most often found on sun-exposed areas. It is not typically associated with a nevus that has increased in size or an irregularly shaped lesion that varies in color.