You daub your face and think I shall not see
Your wrinkles. You deceive yourself, not me.
A small defect is nothing when revealed;
But greater seems the blemish ill concealed.

[Lomento rugas uteri quod condere temptas,
Polla, tibi ventrem, non mihi labra linis.
Simpliciter pateat vitium fortasse pusillum:
Quod tegitur, magnum creditur esse malum.]

Martial (AD c.39-c.103) Spanish Roman poet, satirist, epigrammatist [Marcus Valerius Martialis]

Epigrams [Epigrammata], Book 3, epigram 42 (3.42) (AD 87-88) [tr. Pott & Wright (1921)]
    (Source)

"To Polla." (Source (Latin)). Alternate translations:

Thou seek'st with lard to smooth thy wrinkled skin,
Bedaub'st thyself, and dost no lover win.
Simple decays men easily pass by,
But, hid, suspect some great deformity.
[tr. Killigrew (1695)]

Leave off thy Paint, Perfumes, and youthful Dress,
And Nature's failing honesty confess;
Double we see those Faults which Art wou'd mend,
Plain downright Ugliness would less offend.
[tr. Sedley (1702), "To Cloe"]

With lotion some wrinkles you labor to hide.
No policy, Polla, you show; but some pride.
A small fault perhaps might more safely appear:
Whatever is hid, draws construction severe.
[tr. Elphinston (1782), Book 6, Part 3, ep. 20]

When you try to conceal your wrinkles, Polla, with paste made from beans, you deceive yourself, not me. Let a defect, which is possibly but small, appear undisguised. A fault concealed is presumed to be great.
[tr. Bohn's Classical (1859)]

Seek not to hide a blemish that's but small.
The fault that's hidden ofttimes greater seems.
[ed. Harbottle (1897)]

You try to conceal your wrinkles by the use of bean-meal, but you plaster your skin, Polla, not my lips. Let a blemish, which perhaps is small, simply show. The flaw which is hidden is deemed greater than it is.
[tr. Ker (1919)]

Applying paste to smooth out the folds in your fat belly only means you are rouging your belly for yourself instead of your lips for me. It wouild be more natural to let that minor flaw stand. The hidden evil is considered worse.
[tr. Bovie (1970)]

You try to hide your belly's wrinkles with bean meal, Polla, but you smear your stomach, not my lips. Better that the blemish, perhaps a trifling one, be frankly shown. Trouble concealed is believed to be greater than it is.
[tr. Shackleton Bailey (1993)]

You use a cream your wrinkles to disguise,
But you're just pulling wool over our eyes.
The wrinkles, left alone, would draw no mention,
But, covered up, they draw closest attention.
[tr. Wills (2007)]

Conceal a flaw, and the world will imagine the worst.
[Source]