Eruption after Calcarea carb in Asthma

Dear Sir's;
My son have 12 years old, when he had 4 years old he had his first bronchospasm, and Homeopath give him Sulphur 200c every sunday during 4 weeks. The three first intakes of the medicine he got a bronchospasm the last one there were no problem. After that we travel to the US to a town near the rocky maountains and he did'n have any relaps over there. We return to Lima-Peru (99% of humidity)near the sea, during the summer he got a kind of eruption like flea bites on chest, back and limbs and feets, itching was terrible and he scratches until breaking the skin, the doctor recomend to wash his body with a iodine soap, the eruption was relieved. Three month later, finishing the fall season, he have a bronchospasm I take him to the hospital and they prescribe salbutamol and prednisona after that he have a new relaps and take another time the remedies. After that I analized him and the repertorization indicate Calc in first option and Ars. on second.
At a new relaps I give him Ars.30c for three days until ther were a little wheezling on the right lung, and no cough. For days later I gave him Cal. 200c in no more than an hour eruptions begin to appear in different parts of the body. Than another relaps take him to the hospital with a begining of focus neumonicus. After this he begin to have a relap evere monday then I give him Tuberculinum 200c because the periodicity and of the relaps and because I though that something is blocking the Calc. action. he got one month without relaps. Then another time relaps but not as severe as on the begining there is only wheezling at from seven to eigth o'clock getting better during the morning until next day then I give Calc. 1M the wheezling disapear until the past week when he went to his mother house near the sea. The symptoms was short breathing, wheezling in between 7 to eight a.m, Loud inspiration and expiration during the night, between 5 and 6 a.m he make like a gurgling sound during the expiration better when he move to the side, stopped nose when go to bed, allergy to the dust. I give him Calc. 10M all the symptoms disappear but the eruption comes inmediately in differnt parts of the body, they are like flea bites, red sorounding he scratches all the day and a thick yellow liquid get out of the eruption after a warm bath.I think that the derange is moving from inside to out side if somebody have experience with this kind of reation please let me know how do you manage it.