Welcome to the forum. Your symptoms indicate that you have sensitive skin. Do not experiment with new detergents, cleaners, emulsions , lotions or soaps that you have never used before. Your skin is suffering from allergy
and that is why you have these red bumps on your torso. You can take anti-allergic ( do not take overdose ) for relief, have patience they will go away.
You should have a warm shower with medicated lotion, use a medicated powder after the shower. Treat your clothes with an antiseptic ( dettol/savlon
) after wash and let them dry in the sun. You can apply neosporin
oitment which is mild and effective in the area affected with the bumps.
You should get relief shortly. In case you have problems consult with your dermatologist
and get treated. Hope you are not allegitic to any food or medicines. If, yes do not take those to keep fit and healthy. Have a nice day, keep fit.