My boy is 6 yr and 7 mnths old he is underweight as having only 17 kg bt he is quiet active as well as good minded bt he is having nt the grwth as per his age i am worried his hb is also 8 . And having a issue of skin allergy in joints specially like the elbow inner side the knee inner side . I have talked a numerous dermatologist bt jab tk medicine tb tk ok after stopping medicine allergy reoccurs plz suggest some valueable remedy