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.
 

You are likely experiencing a heat rash and chafing in your private areas. This usually happens because perspiration becomes trapped against the skin thereby irritating. Signs may include redness, itching, and sometimes little bumps. To assist with this, tighten any loose-fitting clothes, stay cool, and ensure it’s dry down there. Apply some soothing ointment and be sure to take breaks if possible.

You are suffering from a long-term problem with your beard itching, redness, and sticky dandruff. A skin condition seborrheic dermatitis may be the cause. Occasionally, the use of antifungal ointments like clotrimazole can be effective, but if this is not the case, you might want to use an ointment with hydrocortisone to decrease inflammation. Remember to wash and dry the area that is affected as this will help with the symptoms.

Hair loss can be due to several factors such as stress, unhealthy diet, or hormone variations. It's normal for humans to shed up to 100 strands of hair daily. But if it's a lot more than usual, you might notice bald spots or thinner hair. Eating well, calming your mind, and using hair products that are not too harsh may help to prevent hair loss.