Which of the following is a general contraindication for massage therapy?

The correct choice highlights a general contraindication for massage therapy due to the nature of skin disorders. Skin disorders can vary widely in severity and type, including conditions that are contagious, inflammatory, or involve open wounds. Massaging over affected areas could exacerbate the condition or lead to the spread of infection, both for the client and the therapist.

In contrast, while muscle strains and joint pain may require careful consideration and tailored approaches, they are not universal contraindications. In some cases, massage and physical manipulation can help alleviate pain and promote healing in strained muscles or painful joints. Therefore, these conditions might be treated with specific techniques or modifications, rather than being outright contraindicated.

Infections, depending on their type and severity, are serious concerns and often lead practitioners to avoid massage in affected areas to prevent worsening the condition or spreading pathogens. However, skin disorders encompass a broader range of issues that can significantly impair the safety and effectiveness of massage therapy.