可以试试以下两种外用的产品

首先，要做到让孩子饮食平衡，生活规律合理。

可以试一下下面的产品。第一种是水杨酸制剂，作用是较温和地帮助去死皮并缓解炎症。第二种是杀菌用，可能会让皮肤有些干燥，可以先试第一种，先试两个星期左右，效果如果不明显可以换第二种或合用。

目前市场上不用处方的粉刺外用药基本上就是靠这两种有效成分了，这两个产品根据推荐说配方是不错的。

walgreens或target大约能找到，如果你在美国的话。

1。Oil-Free Acne Stress Control 3-In-1 Hydrating Acne Treatment
by Neutrogena

Price:         $7.99/2 fl. oz.
  

Review:
Oil-Free Acne Stress Control 3-In-1 Hydrating Acne Treatment gets Neutrogena back into the BHA game, and it’s about time! Most of their previous BHA products either contained irritating ingredients (particularly alcohol and menthol) or had a pH that was too high for effective exfoliation to take place. This version contains 2% salicylic acid at a pH of 3.4, and comes in a nearly weightless silicone base that includes antioxidants and anti-irritants. Although the inclusion of fragrance and coloring agents is a slight disappointment, it’s a relief that Neutrogena omitted menthol or its derivatives, making this an all-around ideal BHA lotion for skin of any type battling blemishes.


Ingredients:
Active: Salicylic Acid (2%), Other: Water, Cyclopentasiloxane, Peg-8, Dimethicone, Dimethicone Crosspolymer, Sodium Polyacrylate, Vinyl Dimethicone/Methicone Silsesquioxane Crosspolymer, Cocamidopropyl Pg Dimonium Chloride Phosphate, Cucumis Sativus (Cucumber) Fruit Extract, Camellia Sinensis Leaf Extract, Glycerin, Panthenol, Butylene Glycol, C12-15 Alkyl Lactate, Cetyl Alcohol, Glyceryl Stearate, Cetyl Lactate, Peg 75 Stearate, Ceteth-20, Steareth-20, Trideceth-6, Cyclopentasiloxane, Peg/Ppg-18/18 Dimethicone, Sclerotium Gum, Laureth 23, Laureth-4, Disodium Edta, Benzalkonium Chloride, Potassium Hydroxide, Green 5, Yellow 5, Blue 1, Fragrance

2。 Persa-Gel 5
by Clean & Clear
   
Price:         $5.89/1 fl. oz.
   
Review:
Persa-Gel 5 is a simple but very effective topical disinfectant for those struggling with acne. Its sheer, water-light texture is great for all skin types, and the 5% benzoyl peroxide formula omits fragrance and needless irritants such as citrus or menthol.
 
Ingredients:
Active: Benzoyl Peroxide (5%)
Other: Carbomer, Disodium Edta, Hydroxypropyl Methylcellulose, Laureth-4, Sodium Hydroxide, Water

 

另外，可以看一下这些信息

http://www.cosmeticscop.com/acne-and-acne-treatment.aspx