Stings and bites from mosquitoes, bed bugs, and horseflies can cause significant discomfort, with some individuals experiencing more severe reactions than others. Dr. Xavier Van der Brempt, a pneumo-allergologist in Namur, Belgium, and coordinator of the Insect Biting Group of the French Society of Allergology, explains that the body's reaction to insect bites involves skin immune cells called mast cells. These cells release histamine in response to proteins found in insect saliva or venom, leading to symptoms like inflammation, redness, swelling, and itching. Scratching the affected area can worsen the reaction by triggering more mast cells to release histamine. For people who experience mild reactions, over-the-counter products such as decongestants or anesthetics may be enough to relieve symptoms. However, for those with more severe reactions, antihistamines and corticosteroids are often more effective. Oral antihistamines like Zyrtec (cetirizine) can be used preventatively in high-risk areas and are practical for multiple bites. Over-the-counter local corticosteroids, available in cream or gel form, are generally safe for children when used in small amounts on limited areas for short periods. However, they should not be applied to acne, rosacea, or infected skin. Several products were tested for their effectiveness and safety in treating insect bites: 1. **Apaisyl Gel 0.75%** (P&G Health France): This over-the-counter medication is a classic anti-itch product suitable for use from 2 years old. However, its active ingredient, isothipendyl chloride, can make the skin more sensitive to sunlight, and the treated area should not be exposed to sunlight. It also contains sorbic acid, which may cause skin irritation in some individuals. 2. **CortiSédermyl** (Cooper): This cream contains hydrocortisone 0.5% and can be used from 6 years old. It should not be applied to acne, rosacea, or infected skin. It also contains lanoline, which may cause contact eczema in some individuals. 3. **Soothing gel Pranarōm**: This product contains essential oils such as spike lavender, turmeric, field mint, and marjoram. It is suitable for those over 6 years old but is not recommended for pregnant or breastfeeding women. The essential oils may contain allergenic substances such as linalool, eugenol, geraniol, and limonene. 4. **Onctose** (P&G Health France): This cream combines an antihistamine and an anesthetic. It contains methenamine methyl sulfate and lidocaine hydrochloride. The product also contains "rose perfume 449S," which contains eight allergens. It is not recommended for use on young children, despite the leaflet not specifying an age limit. 5. **Pruriced SOS Soothing after-bite** (Uriage): This roll-on product contains calamine, extract of Sichuan pepper fruit, and aloe vera. It may be suitable for slightly reactive skin but is not recommended for use from birth, contrary to what is indicated on the packaging. It also contains limonene, a perfuming and allergenic molecule. 6. **Urtigel Gel after-bite** (Weleda): This product contains extracts of stinging nettle and arnica. It may be suitable for individuals who are not highly reactive to insect bites and not allergic to asters. It is usable from one year old and contains a simple formula with only four additional ingredients: water, alcohol (possibly irritating), glycerin, and xanthan.