Lumps on bottom of foot

Please HELP US! My son has these lumps on the bottom of his foot. These lump are hollow, nothing inside of them. They are more like bubbles but they are in a cluster. He had 2 clusters of about 4-6 bubbles in each cluster 2 weeks ago but now he has about 15 bubbles in one cluster, 7-9 bubbles in another cluster, and now the thrid cluster he recently got has about 4 bubbles in it. This is spreading and it's painful! Think of grapes..hollow grapes and thats what it's like! There is no blood inside of these bubbles and no infection but they hurt my son and he is finding it hard to walk due to the pain. Do you know what this could be and can we get something over the counter to get rid of it? Or do you think he should see a Dr. to get medications?

[Dr_Aparna]

Hi,
This maybe eczema.The term eczema is broadly applied to a range of persistent skin conditions. These include dryness and recurring skin rashes which are characterized by one or more of these symptoms: redness, skin edema (swelling), itching and dryness, crusting, flaking, blistering, cracking, oozing, or bleeding.
Dyshidrosis is a less common eczema which  only occurs on palms, soles, and sides of fingers and toes. Tiny opaque bumps called vesicles, thickening, and cracks are accompanied by itching which gets worse at night. A common type of hand eczema, it worsens in warm weather.
For mild-moderate eczema a weak steroid may be used (e.g. hydrocortisone or desonide), applied to the affected areas.
It could also be a fungal infection in which case you may have to apply OTC anti-fungal ointments.If neither helps in causing a resolution then please do visit a doctor and get him attended to.
ref:http://en.wikipedia.org/wiki/Eczema

[MsWindy]

Thank You so much!!!!!