Symptoms of Cystic Hygroma
The symptoms and signs of cystic hygroma vary with the location of the cluster of cysts. However, because many are present in the neck, they can produce symptoms that range from none to severe. Signs and symptoms of cystic hygroma are as follows:

clusters of clear, black, or red vesicles on buccal mucosa or the tongue (microcystic form)
large cysts with overlying bluish or normal-appearing skin (macrocystic form)
sleep apnea, occasionally obstructive
breathing difficulties
feeding difficulties
failure to thrive (especially in children who have involvement of the gastrointestinal tract)
intra-lesional bleeding (rare)