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A chalazion is a hot, red, painful lump under or on the eyelid, which appears within a day or two. Also, it exists other symptoms.
Its size may be that of a lentil or a pea, or sometimes even an olive. The chalazion may be on the outside of the eyelid and may be seen easily, but it can also be on the inner side: from the outside, the eyelid is simply red and swollen, and the eyelid must be everted to see the chalazion.
More information about chalazion:
What is a chalazion?
How do you differentiate a chalazion from a stye?