Antihistamine creams and tablets are medications that can ease an itch resulting from an allergic reaction. They work by blocking histamines binding to your cells and thus, prevent the release of mediators that cause the symptoms of allergy (including itching).  Apply Benadryl (diphenhydramine) topical cream to the skin or take oral tablets/liquid before bedtime. Besides helping with the itching, oral Benadryl also causes drowsiness, which can help you sleep better.  If you have large areas of skin that itches, you should choose an oral anti-histamine instead of putting a topical cream on a large area. However, choose either the topical cream or the oral diphenhydramine. Never use both together or you could be exposed to too much of the medication. Always follow the directions in the label and never exceed the recommended dose. Other antihistamines you can try include over-the-counter Zyrtec (cetirizine) and Claritin (loratadine). Make sure you check with your doctor or pharmacist before taking oral medications if you have medical conditions, allergies to medicines, or take other medications. Corticosteroids are effective in controlling inflammation by altering the function of a number of cells and chemicals in the skin. If the itching is caused by an inflammatory condition (such as eczema), try using corticosteroid cream.  When using corticosteroid cream, you may want to cover the area with a damp cotton material soaked in water. This will help the skin absorb the cream.  Corticosteroid creams are available in mild forms over-the-counter, or stronger by prescription only. If the itchy area isn’t large, your doctor may prescribe calcineurin inhibitor drugs (such as Protopic or Elidel) instead of corticosteroid creams. These may help for mild itching if you prefer not to use over-the-counter or prescription medications. Apply the moisturizing cream before bedtime and, in case of a prolonged condition, at least twice a day until the symptoms are gone.  Try Cetaphil, Eucerin, Sarna, or CeraVe moisturizers or...

TL;DR in Indonesian:
Gunakan antihistamin oral atau topikal. Oleskan krim kortikosteroid ke permukaan kulit yang gatal. Gunakan pelembap, krim pelindung, atau krim antigatal pada kulit yang gatal. Berikan kompres dingin dan basah pada kulit yang gatal. Mandi berendam dalam larutan oatmeal atau soda kue hangat sebelum tidur. Kenakan piyama katun atau sutra yang longgar. Hindari mengenakan benda yang dapat mengiritasi kulit di malam hari.