<s>[INST] my toddler has developed a rash with little red bumps on clusters on her chest, thighs, nevk, legs and arms. the bumps mainly appear in the evening and fade in the morning. nothing has changed in her diet or enviroment . doc said flea bites but I dont think they would just appear in the evening. [/INST] Hello It appears to be urticaria (allergic) rashes. The reason for coming up in the evening and nighttime can be due to hypersensitivity to insect bite or to any particular chemical to which he gets exposed in the evening. Use of antiallergic like cetirizine helps in relieving the acute symptoms. Adding montelukast helps in controlling the repeated attack. So my suggestion is to give montelukast cetirizine combination and try to find out the causative agent so that it can be better avoided. Regards </s>