That would be proper body MECHANICS.
I believe it's a color dye from pants or a shirt that must have gotten wet and stained your clothes. You should take a shower to get rid of any dyes that are on your body - if you see a rash see the doctors. To get rid of the stain, use bleach and dip the clothing in wet water and let it air dry.
Answer:
1) preventive interventions are those that prevent disease from occurring and thus reduce the incidence of disease, and (2) therapeutic interventions are those that treat, mitigate, or postpone the effects of disease, once it is under way, and thus reduce the case fatality rate or reduce the disability or morbidity associated with a disease.
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