I think it could be eczema or trash mouth might be.
Bacterial infection can cause complications.Try to get removed from this.
I think it could otitis media.Never put any fluid just share with your GP.Anyhow you may take Broad spectrum antibiotic.
Gaining weight is easy but loosing it seems to be very difficult. Vitamins are very helpful to dissolve fats.The use of pressure mattress might be helpful for in this regard.