A pus-filled swelling after an insect bite usually suggests that the area has become infected due to scratching, irritation, or bacteria entering the skin. The affected area may become red, warm, painful, swollen, and may release pus over time. To help the swelling heal, keep the area clean by gently washing it with mild soap and water, and avoid scratching or squeezing the swelling because this can spread the infection and worsen the inflammation. Applying a warm compress for 10-15 minutes a few times a day may help reduce pain and encourage drainage naturally. A doctor may prescribe an antibiotic cream or oral antibiotics if the infection is significant, and pain-relieving medicines may help if there is discomfort. If itching is present, antihistamine medicines may also provide relief. Keep the area dry and covered with a clean dressing if pus is draining. If the swelling becomes very large, extremely painful, spreads rapidly, is associated with fever, red streaks, or difficulty moving the nearby body part, you should seek medical attention promptly because it may require drainage or stronger treatment. People with diabetes or weak immunity should be especially careful, as skin infections can worsen more quickly in such cases.

For an inflamed red rash, you can apply a mild over-the-counter 1% hydrocortisone cream twice daily to reduce swelling and itching. Soothing moisturisers containing colloidal oatmeal or calamine lotion can also help. If itching is severe, an oral antihistamine may provide relief. However, avoid hydrocortisone if you suspect an infection (e.g., if there is pus, oozing, or warmth). Since rashes have many causes, please see a doctor if it spreads, becomes painful, blisters, or does not improve within a few days so you can get a proper diagnosis and the right prescription treatment.

Persistent itching that returns hours after applying ointment is commonly caused by fungal infections (jock itch) or eczema, but it can indeed be a symptom of STIs like scabies, pubic lice, or herpes. The temporary relief suggests your current ointment isn't targeting the root cause. To treat this permanently, avoid self-medicating and see a doctor or dermatologist. They can properly diagnose the issue and prescribe the correct strength of antifungal, steroid, or antiparasitic medication. Meanwhile, keep the groin area clean and dry, and avoid tight clothing.

Rashes between the legs are often caused by fungal infections, sweating, or skin irritation from friction. Keeping the area clean and dry and wearing loose cotton clothing may help reduce irritation. Antifungal creams or powders are commonly used to treat this type of rash. Consult a doctor to confirm the cause and recommend the suitable medicine.