Pray and ask for blessings for the Prophet& for his family (S.A.W

When the Holy Prophet (S.A.W.) would see a pimple on his body he would
seek refuge in and humble himself to Allah. He would be asked: 'Does
it matter, O Messenger of Allah?' He would say that 'If God wanted to
turn a minor concern into a major one, He could; and if He wanted to
turn a major concern into a minor one, He could'. [Reference: Makarim
al-Akhlaq]

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Imam al-Sadiq (A.S.) said: Truly, there no ache, misfortune,
headache
or malady but because of a misdeed (sin); and that is (found) in
Allah's saying: "Whatever affliction may visit you is for what your
hands have earned; and He pardons much." And what Allah pardons is
more than what He punishes for." [Reference: Makarim al-Akhlaq]

================================================== ===============Imam al-Sadiq (A.S.) said: "When the believer experiences a single
episode of fever, his sins would fall off as tree leaves would; and if
he becomes bed-ridden, his moaning is counted as tasbeeh (glorifying
God)". [Reference: Makarim al-Akhlaq]

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Imam al-Sajjad (A.S.) said: " What a perfect ailment fever is! It
gives each organ its fair share of the affliction; and there is no
good in someone who is not afflicted." [Reference: Makarim alAkhlaq]

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Zararah quoted either Imam al-Sadiq (A.S.) as saying: "Having a single
sleepless night from an ailment is superior to, and greater in reward
than a year's worship."
[Reference: Makarim al-Akhlaq]

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Imam al-Baqir (A.S.): "One night's fever equals two years of worship;
two nights' fever equals two years of worship; and three nights' fever
equals seventy years of worship". Abu-Hamza al-Thumali said; "What if
he does not attain Seventy?'' I asked (the Imam). He said: "Then (it
will be reckoned) to his parents". "What if they do not attain
(Seventy)?" I asked. He said: "Then it will be reckoned to his
relatives." And what if the do not attain Seventy" I said.
He said: "Then it will be reckoned to his neighbours". [Reference
Makarim al-Akhlaq]

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Imam al-Sadiq (A.S.) said: "If Allah favours a servant, He would look
at him; and if He does, He would present him with one of three things:
Fever, eye-ache or headache." [Reference: Makarim al-Akhlaq]

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The sick person has four peculiarities: His misdeeds are off the
record, Allah commands an angel to record every kindness he used to do
in his health, his illness goes after every organ in his body and
removes its sins from it so that he will end up being forgiven whether
he dies (from the illness) or survives it. [Reference: Makarim
al-Akhlaq]

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The Holy Prophet (S.A.W.) said: "The perfect visitation of the sick
person is when you put your hand on him and ask him how he is feeling.
And the handshake is the perfect greeting." [Reference: Makarim
al-Akhlaq]