You used a lipstick that may have had some mold on it. Makeup products mold due to age or contamination sometimes. The yellow spot you noticed could be mold. You do not feel any discomfort, so you are probably fine. Always remember to wash the lipstick before using it again. You should also check for any changes on your lips and see a doctor if you notice something unusual.

You may have molluscum contagiosum, a viral skin infection that causes small bumps with a white or shiny center. These bumps can appear on your face, neck, arms, or other body parts. It spreads through direct contact. Treatment may include creams, but sometimes the bumps go away. Keep the area clean and avoid scratching to prevent spreading it to others.

Laser hair removal can be an effective way to remove unwanted facial hair. But it is important to discuss any hormonal imbalances with your doctor before beginning a treatment plan. Laser hair removal may not be the best option for you if your DHEA level is high as this could lead to an increased risk of side effects. Your doctor may suggest other options such as oral medications, topical creams, or electrolysis.

You may have a fungus infection in your groin. It may result in scratching and irritation of the affected areas. I suggest you go to a dermatologist who can diagnose and cure your disease.
 

It sounds like you may have eczema, a common skin condition that can cause itching, redness, and irritation. To determine if this is the case, you should see a dermatologist. The dermatologist can recommend an appropriate treatment plan that may include topical medications, light therapy, or oral medications. Additionally, lifestyle changes can help to manage symptoms including avoiding potential triggers, wearing loose fitting clothing, and using a humidifier in your home.

Your skin might be affected by acanthosis nigricans which is identified by dark patches, even on the throat and joints. Being overweight and having high blood pressure are risk factors for this. The treatment is to lose weight and control the BP, as a result, the patches can be healed. Follow a healthy diet, exercise regularly, and be consistent with your prescribed medications to control your blood pressure.