Thanks for posting your query at DoctorSpring.com. I can understand your concern.
From the history provided by you, it could have been scabies. The other three members of the family ideally would get scabies due to close contact, but the incubation period of scabies being one month, you might start showing symptoms now since a month has passed. The very fact that she has a recurrence suggests that all the family members haven't been treated and need to be treated as the infection still persists in the subclinical form among the family members.
I would recommend that she reapply the permethrin cream once. Also she seems to have got an allergy to the scabies mite antigens which is referred to as hypersensitivity.
She needs to be administered an anti histamine syrup like hydroxyzine for which a prescription from the doctor will be required.
Application of fucidin cream over the lesions in hand will resolve it. This will need a prescription from your doctor.
The one year old child needs to be treated with a cream called crotamiton and not permethrin.
Both of you, the parents need to apply the permethrin cream.
Hope my recommendations are helpful. Please let me know if you have any queries.
Patient replied :
Hello Dr Kruti. Thank you for your assistance. The question that comes to my mind is does this Mite infection/ infestation and it's consequences (the acropustulosis on her hands for instance) have a chance of going away on its own? In other words, if not all the mites are dead, will she ever be cured or will they simply persist? Will they just keep reproducing and spreading?
The scabies mite doesn't keep reproducing n spreading if proper treatment is taken by all the family members living together.
The mite is killed with treatment and the person is relieved of the infestation.
The main problem is when the infection keeps spreading among family members from one to the other and back. Hence treatment of everyone is important, but once that is done, there is nothing to worry and the infestation does not persist.
The acropustulosis needs to be treated with an antibiotic cream.
Hope I have answered your queries.
Please let me know if you have any queries.