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Usually, the reasons for these pimples are open pores, dirt, and bacteria. They can be manifested as red bumps that are filled with pus. Over-the-counter acne specialty products that contain ingredients such as benzoyl peroxide or salicylic acid to clear the acne should be tried, during this period, for the help of the pimple. Next, keep a clean face and do not touch or pick the pimple to prevent scars.

Psoriasis can be a bit challenging to treat but various treatments like medications, laser treatments, alternative treatments like homeopathy etc., avoiding triggers that worsen your psoriasis symptoms can prove useful. I suggest talking to your doctor for proper examination of your condition which will help in deciding which is the best treatment for your condition. 

You might have contracted a fungal infection called ringworm on your privates. Ringworm can be distinguished as a red itchy patch on the skin, which can develop into a dark-colored patch. Due to a fungus, it is caused. Use antifungal cream or powder to get it to go away. Remember to keep the area away from any dirt, moisture, and sweat. Please do not share the bath towels or clothes with anyone as this will help you stay safe from the infections.